isotope has 52 protons and 75 neutrons? (A) (B) (C) (D) Rhenium - 75 Rhenium - 127 Tellurium - 52 Tellurium - 127 4. What is the molar mass of Al2(SO4)3? (A) (B) (C) (D) 214.17 g/mol 278.03 g/mol 342.17 g/mol 450.09 g/mol 5. What is the percent composition of water in Plaster of Paris‚ (CaSO4)2 • H2O? (A) (B) (C) (D) 6.207% 13.81% 33.09% 93.79% Page 1 Chemistry 2202 June 2010 6. Gas filled glass tubes are used as lighted store
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November 15‚ 2007 Synthesis of 1-Bromobutane Introduction: The purpose of this experiment is to synthesize 1-bromobutane from 1-butanol and sodium bromide. In order for this reaction to reach completion there are four major operations that need to be performed. The four major operations include refluxing‚ simple distillation‚ separation‚ and drying. To begin‚ in order for the compounds to react they will be dissolved in water and sulfuric acid will be added. The addition of sulfuric acid will
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91 Chapter 5 Sources of plant nutrients and soil amendments A large number of diverse materials can serve as sources of plant nutrients. These can be natural‚ synthetic‚ recycled wastes or a range of biological products including microbial inoculants. Except for microbial inoculants (biofertilizers)‚ all of these contain one‚ two or several plant nutrients in readily or potentially available forms. A certain supply of mineral and organic nutrient sources is present in soils‚ but
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PROCEDURE 1. Measure and cut a piece of magnesium ribbon 3.5 to 4.5 cm long. Do not exceed 4.5 cm. 2. Measure the mass of the magnesium ribbon to the nearest milligram (0.001 g) and record the mass. 3. Fold up the magnesium ribbon into a small‚ tight bundle. Tie it with a piece of thread (10 to 15 cm long). 4. Add about 10 mL of 3.0M HCl to a gas collection tube. 5. Hold the gas collection tube at an angle as you fill it completely with tap water‚ until it is nearly overflowing
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and isopentyl alcohol‚ using concentrated sulfuric acid as a catalyst. The product was washed using sodium bicarbonate and water‚ then dried with anhydrous sodium sulfate. It was then distilled using a standard simple distillation apparatus. The percent yield of isopentyl acetate was 60.39%. This may have been low due to incomplete distillation or evaporation once entering the receiving flask. The product had a distinct “banana oil” smell‚ making the reaction successful. Introduction The purpose
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Date Work Submitted: February 24‚ 2010 Abstract: The percent yield of the color Indigo that is the color of blue jeans for the three trials was determined to be 13.50%‚ 15.30% and 14.80%. A series of experiments were performed to a cloth dye comparison. The absorbance of Disulfonic Acid in the experimental trial was 608nm with an absorbance of 1.037 with Beer’s law the epsilon value was determined to be 22416.67m-1c-1. The percent yield of the second indigo Carmine experiment was determined to
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I. Results Started with : 40mL acetic acid 4.005g PHPB 2.00g trans-stilbene 1.54g KOH 13mL methanol 21mL ethylene glycerol 2.726g stibene dibromide produced Actual yield : 0.818g diphenlacetylene Melting Point : 62 - 75 degrees Celsius II. Discussion The experimental melting point range of our purified product was 60 degrees Celsius when researched‚ but when done experimentally was only. This began around the right range‚ but ended up being much higher than the literature value
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Introduction: The purpose of this lab was to learn how to use salicylic acid to make aspirin. Aspirin is the most widely used over-the-counter drug in the world. The average tablet contains about 325 milligrams of acetylsalicylic acid with an inert binding material such as starch. Aspirin is used to relieve pain‚ reduce inflammation‚ and lower fever. Aspirin originally was derived by boiling the bark of the white willow tree. Although the salicin in willow bark has analgesic properties‚ purified
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also included the birth of the Ideal Gas constant “R”. R’s value is approximately .0821 L x atm./K x mol. To verify Avogadro’s gas constant R this experiment combined various amounts of NaHCO3 (limiting reagent) with excess CH3COOH to produce various volumes of CO2 gas. By using NaHCO3 as the limiting reagent‚ the experiment was able to conduct multiple trials with varying amounts of NaHCO3 to best test Avogadro’s theory. NaHCO3(s) + CH3COOH(aq) → NaCH3COO(aq) + CO2(g) + H2O(l)
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such as atoms‚ molecules‚ or other specified particles. In all Stoichiometry problems‚ there are 4 or 5 basic steps which are: write and balance your reaction‚ with some reactions with more than one value known you need to figure out which is the limiting reactant and which is the excess reactant‚ find the known and unknown reactant or product‚ find the mole ratio‚ set equal‚ cross-multiple‚ then find your answer. Writing a balanced reaction would look like if you had Chlorine and Silver and made
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